Let U = {q, r, s, t, u, v, w, x, y, z}, A = {q, s, u, w, y}, B = {q, s, y, z}, and C = {v, w, x, y, z}. List the elements in the following set.
? 
A. {q, s, u, v, w, x, y, z}
B. {r, t}
C. {q, r, s, t, u, v, x, z}
D. {w, y}
Answer: B
Mathematics
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